Abstract
We report the anisotropic optical property study on the band-edge excitonic transitions of ReSe 2 single crystals doped with Au. The temperature-dependent piezoreflectance (PzR) and photoreflectance (PR) spectra with E||b and E⊥b polarizations in the near band-edge region provide conclusive evidence that band-edge excitonic transition features, namely E 1 e x , and E 2 e x / E 3 e x are from different origins. The features located at higher energy side correspond to the Rydberg series starting with principal quantum number n = 2. The doping effects were presented and discussed.
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